/Engine/Source/Runtime/Engine/Classes/GameFramework/CharacterMovementComponent.h
Check if pawn is falling
virtual bool CheckFall ( const [FFindFloorResult](API\Runtime\Engine\FFindFloorResult) & OldFloor, const [FHitResult](API\Runtime\Engine\Engine\FHitResult) & Hit, const FVector & Delta, const FVector & OldLocation, float remainingTime, float timeTick, int32 Iterations, bool bMustJump )